# US 4,399,249 A · Resealable pressure sensitive adhesives and products > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,399,249 A - Document ID: US4399249A - Status: Granted - Kind: A - Application number: 06/220,116 - Filed: 1980-12-24 - Granted: 1983-08-16 - Earliest claimed: 1980-12-24 - Assignees: Eschem Inc. - Inventors: Leon L. Bildusas - Web page: https://patentgrep.com/patent/US4399249A ## CPC - C09J 153/025: {modified} - C09J 7/387: {Block-copolymers} - C08L 2666/04: Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof - C08L 2666/28: Non-macromolecular organic substances - Y10S 206/813: Adhesive - Y10T 428/31844: Of natural gum, rosin, natural oil or lac - Y10T 428/31855: Of addition polymer from unsaturated monomers - Y10T 428/31913: Monoolefin polymer - Y10T 428/31931: Polyene monomer-containing - C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Pressure sensitive adhesive compositions are provided that are especially suitable for forming contact bonds that are resealable to polyethylene surfaces at room temperature. Such adhesive compositions include a blend of a linear or a radial block copolymer, an end-block modifying resin compatible with the end or thermoplastic block of the copolymer and incompatible with the mid of elastomeric block, a plasticizing process oil compatible with the mid or elastomeric block, and, only if desired, not more than about 14 weight percent of a mid block or elastomeric block associating or modifying resin compatible with the mid or elastomeric block and incompatible with the end or thermoplastic block. A particularly advantageous utilization of these compositions is as a releasable and resealable sealing strip for thin-walled storage or sandwich bag products made of a polyolefin film. ## Claims ### Claim 1 A resealable and releasable pressure sensitive adhesive composition comprising: between about 20 and 60 weight percent based on the total weight of the composition of a block copolymer having non-elastomeric polymer blocks and at least one elastomeric polymer block, each said non-elastomeric block being a monoalkenyl arene polymer block, said elastomeric block being a hydrogenated conjugated diene polymer block; between about 5 and 50 weight percent based on the total weight of the composition of an end block modifying resin that includes a monoalkenyl arene, said end block modifying resin being compatible predominantly with the non-elastomeric block and substantially incompatible with the elastomeric block; between about 20 and 60 weight percent based on the total weight of the composition of a plasticizing process oil that is compatible predominantly with said elastomeric block and generally incompatible with the non-elastomeric block of the block copolymer; and not more than 14 weight percent based on the total weight of the composition of a mid block modifying tackifying resin that is compatible predominantly with the elastomeric block and substantially incompatible with the non-elastomeric block of the block copolymer. ### Claim 2 (depends on 1) The pressure sensitive adhesive composition of claim 1, wherein said end block modifying resin is a thermoplastic, non-elastomeric resin and said mid block modifying tackifying resin is an elastomeric resin. ### Claim 3 (depends on 1) The pressure sensitive adhesive composition of claim 1, wherein said non-elastomeric polymer block of the block copolymer includes styrene, alphamethylstyrene, tert-butyl styrene or vinyl toluene. ### Claim 4 (depends on 1) The pressure sensitive adhesive composition of claim 1, wherein said elastomeric polymer block of the block copolymer includes polybutadiene, polyisoprene, saturated polyolefins or poly(alpha-mono olefin) blocks. ### Claim 5 (depends on 1) The pressure sensitive adhesive composition of claim 1, wherein said end block modifying resin is a thermoplastic compound selected from the group consisting of polystyrene, alpha-methylstyrene, poly(alpha-methylstyrene-vinyl toluene) copolymers, polyindene resins, metal resinates, coumarone-indene resins, phenolics, and mixed aromatics. ### Claim 6 (depends on 1) The pressure sensitive adhesive composition of claim 1, wherein said process oil is selected from the group consisting of petroleum fractions, alkylaryl resins, vegetable oils, animal oils, mixed olefin oligomers, polyterpene oligomers, mineral oils, naphthenic oils, and paraffinic oils. ### Claim 7 (depends on 1) The pressure sensitive adhesive composition of claim 1, wherein said mid block modifying tackifying resin is selected from the group consisting of polyhydric esters of rosin, hydrogenated rosin esters, polyhydric alcohol esters, synthetic polyterpenes, terpene-olefin copolymers, terpene phenols, tall oil rosin, synthetic hydrocarbon resins, olefinic resins, phenol-aldehyde resins, alpha-pinene resins, beta-pinene resins, and poly(1,3-pentadiene-2-methyl-2-butene) copolymers. ### Claim 8 (depends on 1) The pressure sensitive adhesive composition of claim 1, further including up to about 5 weight percent of a composition-stabilizing additive, based on the total weight of the composition. ### Claim 9 (depends on 1) The pressure sensitive adhesive composition of claim 1, wherein said composition includes not more than about 7 weight percent of said mid block modifying tackifying resin. ### Claim 10 (depends on 1) The pressure sensitive adhesive composition of claim 1, wherein said composition includes not more than about 5 weight percent of said mid block modifying tackifying resin. ### Claim 11 (depends on 1) The pressure sensitive adhesive composition of claim 1, wherein said block copolymer and said process oil are present in the composition at a weight ratio of approximately 1 to 1. ### Claim 12 (depends on 1) The pressure sensitive adhesive composition of claim 1, wherein said composition includes between about 25 and 45 weight percent of said block copolymer, between about 10 and 40 weight percent of said end block modifying resin, and between about 25 and 45 weight percent of said process oil, all as based on the total weight of the composition. ### Claim 13 (depends on 1) The pressure sensitive adhesive composition of claim 1, wherein said composition includes between about 30 and 40 weight percent of said block copolymer, between about 15 and 35 weight percent of said end block modifying resin, and between about 30 and 40 weight percent of said process oil, all as based on the total weight of the composition. ### Claim 14 (depends on 1) The pressure sensitive adhesive composition of claim 1, wherein said composition includes between about 25 and 45 weight percent of said block copolymer, between about 10 and 40 weight percent of said end block modifying resin, between about 25 and 45 weight percent of said process oil, and between about 1 and 7 weight percent of said mid block modifying tackifying resin, all as based on the total weight of the composition. ### Claim 15 (depends on 1) The pressure sensitive adhesive composition of claim 1, wherein said composition includes between about 30 and 40 weight percent of said block copolymer, between about 15 and 35 weight percent of said end block modifying resin, between about 30 and 40 weight percent of said process oil, and between about 3 and 5 weight percent of said mid block modifying tackifying resin, all as based on the total weight of the composition. ### Claim 16 (depends on 1) The pressure sensitive adhesive composition of claim 1, wherein said non-elastomeric block of the block copolymer is styrene, said elastomeric block of the block copolymer is isoprene, and said process oil is a paraffinic oil. ### Claim 17 A method of providing a resealable and releasable pressure sensitive adhesive composition, comprising blending together an admixture including: between about 20 and 60 weight percent based on the total weight of the composition of a block copolymer having non-elastomeric polymer blocks and at least one elastomeric polymer block, each said non-elastomeric block being a monoalkenyl arene polymer block, said elastomeric block being a hydrogenated conjugated diene polymer block; between about 5 and 50 weight percent based on the total weight of the composition of an end block modifying resin that includes a monoalkenyl arene, said end block modifying resin being compatible predominantly with the non-elastomeric block and substantially incompatible with the elastomeric block; between about 20 and 60 weight percent based on the total weight of the composition of a plasticizing process oil that is compatible predominantly with said elastomeric block of the block copolymer and substantially incompatible with said non-elastomeric block; and not more than 14 weight percent based on the total weight of the composition of a mid block modifying tackifying resin that is compatible predominantly with the elastomeric block and substantially incompatible with the non-elastomeric block of the block copolymer. ### Claim 18 (depends on 18) The method of claim 18, wherein said end block modifying resin is a thermoplastic, non-elastomeric resin and said mid block modifying tackifying resin is an elastomeric resin. ### Claim 19 (depends on 1) The pressure sensitive adhesive composition of claim 1 wherein said adhesive composition has an adhesive strength to polyolefins on the order of about 80 to 300 grams per inch of width of adhesive.